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Co - ordinate Geometry 3D Geometry
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Q.
Angle between the lines whose direction cosine is given by l + m + n = 0 = l
2
+ m
2
– n
2
is
A.
π/6
B.
π/4
C.
π/3
D.
π/2
E.
None of the above
View Answer
Correct choice: C
Explanation:
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